Water flows at 5 km/h through a cylindrical pipe of internal radius 7 cm into a rectangular tank 20 m long and 11 m wide. In how many hours will the water level in the tank rise by 1.4 m? Take \(\pi = \frac{22}{7}\).
A. 4 hours
B. 3.5 hours
C. 2 hours
D. 5 hours